Burmese Opium Antique Weights Group of 6, Hintha Bird Style 6 sided rounded base. Although widely known as opium weights these bronze zoomorphic weights were used for the measurement of basic necessities throughout Burma (and also northern Thailand and Laos). A full set of weights normal consists of 10 pieces from very small sizes up the largest size known as a viss (around 1.6kg). The weights and measures system in Burma was carefully controlled and weights checked for accurancy. The production of these weights ended in Burma after the British took control of the country in 1885. Early to mid 19th century. Extremely Rare and in good condition.